trudeau



(No Model.) 3 Sheets-Sheet 1. J. A. G. TRUDEAU. ELECTRIC CURRENT TRANSFORMER.

, .zliiorneya.

AWE/V2011? (/OJQO/Z A. 6. Wudeau/ Patented Feb. 26, 1895.

WIIJVE-S'SE (No Model.) 3 Sheets-Sheet 2.

. J. G. TRUDEAU.

ELECTRIC CURRENT TRANSFORMER.

No. 534,678. Patented Feb. 26,1895.

z E mi m p a n W m M m j 4 R M w r m w m 2 G n W5 m J c (No Model.) 3 Sheets-Sheet 3.

J. A. G. TRU DEAU.

ELECTRIC CURRENT TRANSFORMER.

No. 584,678. Patented Feb. 26, 1895.

awvowlioz lm WWO 0% l WM 1 55% W mlbr mm m UNITED STATES JOSEPH A. G. TRUDEAU,

PATENT OFFICE.

OF OT'lAlVA, CANADA.

ELECTRIC-CU RRENT TRANSFORMER.

SPECIFICATION forming part of Letters Patent No. 534,678, dated February 26, 1895.

\ Application filed Apiil 6, 1894. Seria1No.506,556. (N0 model.)

To aZZ whom it may concern.-

Be it known that I, JosEPH A. G. TRUDEAU, a citizen of the Dominion of Canada, residing at Ottawa, in the Province of Ontario and Dominion of Canada, haveinvented certain new and useful Improvements in Current-Transformers, of which the following is a specification.

My invention consists in a commutator or current changer designed to convert an alter nating current into a continuous or smooth current; or to convert a continuous current into an alternating one, as desired.

The invention is illustrated in the accompanying drawings, in Which Figure 1 is a perspective view of my improved device; Fig.2, a similar view of the same in modified form; Figs. 3, 4, 5 and 6, diagrams illustrating the circuits or paths of the currents under varying conditions; and Fig. 7, an end elevation, showing radial brushes or contacts.

My invention enables me to utilize all the impulses in one and the same coil or translating apparatus. So too it enables me to utilize the entire output of a continuous current generator in an alternating translating device.

Referring again to the drawings, A and B, Fig. 1, indicate two rotatable drums, hubs, or cylinders, each provided with separated and insulated metallic strips or bars a, and b.

Cindicates one group, and D anothergroup of brushes or contact devices adapted and arranged to bear upon the bars or strips (land I) of the drums or cylinders A and B.

As shown inthe several figures, the bars a and b are arranged lengthwise thereof, or parallel with the axis of rotation, and extend past each other at the mid-length of the drums, about one-half their length. In other words, the arrangement is such that at the midlength of the cylinders or drums the bars a and b follow one another in close succession orare alternated, while at one end the bars a directly succeed one another and at the other end the bars 1) directly succeed one another, wide spaces intervening at said ends.

The group C of brushes or contacts comprises three independent members, designated 1, 2 and 3, and similarly the group D comprises three independent members, designated 4, 5 and 6. Each contact device is provided with a binding post or other means of attaching a conductor, and the contacts of the two groups are coupled by wires or otherwise, in a certain order, which it is not necessary to disturb, whether it be desired to convert an alternating current into a continuous one, or a continuous into an alternating current. Thus contact 1 is electrically connected with contact 4, and contact 3 is electrically coupled with contact 6. The current enters either by contact 2 or by contact 5, in any case entering by the one and leaving by the other.

The hubs, drums or cylinders A, B, are designed to be rotated by any convenient means, depending in some measure upon the work to be done. If, for instance,it be designed to convert an alternating current into a continuous one, it will be found advantageous to place the drums or cylinders directly, upon the generator 'arbor, or to gear them therewith, and it will be necessary to so space the bars a b with reference to the brushes as that each alternation shall be coincident with a change of contact from bars of one designation to those of different designation. lhis will be better understood when the circuits are traced out later.

In Fig. 2 l have represented a single drum or cylinder, but have shown the two groups of contact brushes arranged to bear upon different portions of its circumference.

The operation and result will be precisely the same under the two constructions.

Referring now to Figs. 3and 4, the circuits will be traced out, assuming that an alternating current is supplied by any suitable generator, as E, to the contacts 2 and 5. First referring to Fig. 3, and assuming that the impulse is from said generator to brush 5, or in the direction indicated by arrow, it will then traverse brush 5, bar I) of drum B, contact 6, and pass by conductor 0 to the translating instrument or coil F, which being wound to the left, will produce a north pole at the entering end of the coil, and a south pole at the exit end, in the inclosed bar G. The current will pass thence by conductorf to contact 1, and by bar a of drum A to contact brush 2, and thence by conductor g back to the generator. Turning now to Fig. 4, and assuming that a current impulse of opposite direction leave the generator E, it will of course pass from the generator in the direction indicated by arrow in said figure or in a direction opposite 5 to that indicated in Fig. 3. Simultaneously with this reversal, the drums A, B, rotate or advance so as to transpose the positions of their bars a, b, relatively to the contact brushes, thereby establishing new paths or to circuits as follows, (see 4:2) Entering by contactbrush 2 the current passes by bar I) of drum or cylinder A, to contact 3, thence by conductor to contact 6, but as this brush at this time bears upon the non-conducting r5 portion of drum B, the current is caused to pass by conductor e to coil F which it thus -enters and leaves in the same direction and with the same effect as before. Thence it passes by conductorfto contact brush 1, but as this also bears upon an insulating portion of its drum or cylinder A, the current passes by conductor cl to contact brush 4, going thence by bar a of cylinder or drum B to contact brush 5, and thence back to the generator, as indicated. In this way each and every impulse is caused to traverse the coil F or other translating device in one and the same direction continuously and without any interruption, thus giving the full effect of a continuous or direct current.

It is manifest that the shifting or transposition of bars a and I) must be synchronous with reversals of the current, when transforming an alternating into a direct current. No

such consideration is, however, involved in transforming a direct into an alternating current, as will be readily seen.

Referring now to Fig. 5, and assuming that the continuous current of a suitable generator H be brought to contact brush 5, with the drums'or cylinders in the position shown in said figure, the current will then pass by bar I) of cylinder B to contact 6, and thence by conductor 0 to the translating device F again 5 represented as a simple magnetizing coil.

From this it will pass by conductorfto contact brush 1, and by bar a of cylinder or drum A to contact brush 2 and back to the generator. The travel of the current through coil G being to the left, its south pole will be at the top and its north pole at the bottom. If now, thedrums or cylindersAand B beturned sufficiently to advance the bars or strips so that bar b shall stand where bar a previously stood in relation to brushes 1, 2, and 3, and bar a shall stand where bar I) previously stood in relation to brushes 4, 5 and 6, or to the positions indicated in Fig. 6, the circuits will he as follows: Still entering by contact brush 6o 5, the current passes by bar a of cylinder or drum B, to contact brush 4, thence by conductor d to contact brush 1, which at the moment rests upon a non-conducting portion of drum or cylinder A. The current therefore takes the path afforded by conductorf, and enters the translating device or coil F from the opposite end, and therefore passes in a right hand direction about the core or bar G, and consequently produces a north pole at the top and a south pole at the bottom.

As often as the relative positions of bars a, b are reversed, there will be reversal of the current in the working circuit, and thusthere is in fact transformation of continuous into alternating current, returning to the generator as indicated.

The rotation of drums A and B may be effected in any convenient way, and the frequency of period may be determined by the speed of such rotation. I have represented the two drums as mounted upon a shaft or arbor, furnished with a band pulley, but this is merely suggestive and not important.

Fig. 2 shows a single drum or cylinder with the two sets of brushes bearing thereon at different points. The operation is precisely the same as before, the only important consideration being that the contact brushes be so set as that when brushes 1 and 2 bear upon a bar a, the brushes 5 and 6 shall bear upon a bar I); and that when brushes 2 and 3 bear upon a bar b, brushes 1 and 5 shall bear upon a bar a. This being manifest from inspection of the drawings, further description is unnecessary.

In Fig. 7 I have represented the brushes as arranged to move or bear radially against the cylinder or drum, which will permit rotation of the latter in either direction at will.

While in Figs. 1, 3, i, 5 and 6 I have shown the drums A and B as separated one from another, it is to be understood that they are in such cases secured upon a common shaft, and are fixed in relation to each other. Consequently they are in effect and may be in fact, one single drum or cylinder,-and it is manifestly immaterial whether the bars a and b be duplicated and arranged in two different series as indicated in said figures, or the two groups of brushes be arranged in line with each other. The mode of illustration is adopted for greater clearness and facility in tracing the circuits.

Having thus described my invention, what I claim is 1. In a current transformer, the combination of a cylinder or drum provided with bars a and I) having their ends extending past each other, two groups of contact brushes 1, 2, 3, and 4, 5, 6, conductor d connecting brushes 1 and 4, and conductor 0 connecting brushes 3 and 6, said parts being arranged substantially as described and shown.

2. The herein-described transformer, consisting of a rotatable drum or cylinder provided with conducting bars or sections a and Z), a group of three brushes 1, 2 and 3, and a second group of brushes t, 5 and 6, conductor d connecting brushes 1 and t, and conductor 0 connecting brushes 3 and 6, the two groups being arranged in such relation to the drums and to each other, that two of the brushes of one group shall bear upon a bar a, necting" brushes 1 and 4c, conductorc connectand two of the brushes of the other group ing brushes3 and 6; atranslating device havshall bear upon a bar I), all at the same time. ingits terminals connected with brushes 1 and 3. In combination with a transformer com- 6; and a generator of electricity having its 15 5 prising a cylinder or drum, insulated conterminals connected with brushes 2 and 5.

ducting bars a and I) carried by the drum; In witness whereof I hereunto set my hand brushes 1, 2 and 3 arranged to bear upon said in the presence of two witnesses.

bars; brushes 4:, 5 and 6 also arranged to bear JOSEPH A. G. TRUDEAU. upon said bars but at a different pointin the Witnesses: ro circumference of the drum or cylinder from WALTER S. DODGE, l the brushes of the first group, conductor 01 con- HORACE A. DODGE. 

